import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextInt()) { // 注意 while 处理多个 case
            String str1=in.nextLine();
            String str2=in.nextLine();
            str1=str1.toUpperCase();
            str2=str2.toUpperCase();
            Set<Character> set=new HashSet<>();
            Set<Character> setB=new HashSet<>();
            for (int i = 0; i < str2.length(); i++) {
                char ch=str2.charAt(i);
                set.add(ch);
            }
            for (int i = 0; i < str1.length(); i++) {
                char ch=str1.charAt(i);
                if(!set.contains(ch)&&!setB.contains(ch)){
                    setB.add(ch);
                    System.out.println(ch);
                }
            }

        }
    }
}